Speedometer light



Feb. 18, 1930. F w, LW RTHY 1,747,355

SPEEDOMETER LIGHT Filed Nov. 24, 1928 L ATTORNEY.

atented Feb. 1, 193a rannron w. nrwonrnr, or nos enemas, cauronnra srnnnomnrnn mam Application filed November 24., 1928. Serial No. 321,7Q1.

This-invention relates to speedometers, and the general object of the invention is to provide a speedometer which will automatically lndicate by a visual signal, such as a flash of a light, when a vehicle on which the speedometer dis mounted travels at a predetermined spee a A more particular object is to provide an adjustable signal on a speedometer for indi-' to eating travel.

Other objects and advantages will appear hereinafter.

The invention is illustrated in the annexed to drawing which forms a tion and in which Fig. 1 is a face view of a speedometer em- .bod 111g my invention.

difi'erent speeds at which a vehicle may 1g. 2 is an enlarged plan partly in section- 20 of the speedometer shown in Fig. 1.

Fig. 3 is a transverse vertical "sectional giewgof my invention taken on line 3-3 of v 1 Fig. 4: is a vertical section taken on line 25 H of Fig. 3. Fig. 5 is a diagram of the light circuit. Corresponding parts are designated by the same reference characters in all the figures.

' In the drawing is illustrated a conven- 39 tional automobile speedometer designated 1 which includes the casing 2, distance indicating wheels 3 and a and speed indicating wheel 5.

In the rim 6 of the speed indicating wheel 5 I provide a light opening 7 over which extends a transparent speed indicatingscale member 8, the rim being provided with an annular groove 9 in its periphery in which the scale member 8 is frictionally fitted so that it-may be shifted circumferentially to bring difierent numbers on the scale into registration with said opening 7 according to the speed desired to be signalled. The upper wall of the casing 2.is provided with a light ening 10 which communicates with a light chamber 11 built on the upper part of the speedometer casing 2, in which chamber is mounted an electric light 12 controlled by an electric circuit 13.

The said rim 6 is slidably mounted upon part ofthis specificamm 6 and scale member 8 are held stationary while the opening 7 in the rim 6 turned to register beneath the desired miles per hour upon the scale member 8, and after the wheel is again balanced and recalibrated the speedometer will signal to the driver of the automobile the speed attained which may be forty-five miles per hour as shown in Fig. 2. The speedometer may be mounted in the usual manner on the instrument board 14 of an automobile with the light chamber ll under said board.

The number on the speed scale 8 over the light opening 7 in the rim of the speed wheel 5 is the number of miles per hour and the speed limit which it is desired to signal when t e automobile on which the speedometer is mounted travels at such speed. The circuit 13 is first closed, andwhen the automobile travels at a predetermined speed limit, thespeed wheel 5 is rotated in the usual manner until such speed limit on the indicating scale 8, which may be 45 miles per hour, and the opening 7 in the rim of the speed wheel 5, register with the speed opening 15 in the front wall 16' of the s eedometer casing 2, whereupon light is pro ected by the electric light 12 through light chamber .11, opening into the speed wheel 5, and through the speed wheel rim opening 7 transparent'scale 8 and opening in the front wall of the -s eedometer casing, thus signalling and inlcating the speed limit through said opening 15.

I claim as my invention: 1. In combination, a transparent speed is slidably scale member for a speedometer, an electric light, and means for projecting the rays of said li ht through a predetermined number of sgi scale representing a predetermined spee j 2. In a'speedometer, a' speed wheel provided with an opening in its rim, a transpar- .ent speed scale member surrounding the periphery of said wheel'rim with a predetermmed number on said member over said o ening, and means for projecting a light t rough said opening and scale when said number and opening register with the speed opening in the face of the speedometer.

3. In a speedometer, a speed wheel provided with an opening in its rim, a transpar- 1o ent speed scale member surrounding the periphery of said rim so that it may be shifted to bring different numbers of the scale into register with said opening, and means for projecting a light outwardly through said i opening and said scale when said-opening and the scale number over it register with the speed opening of the speedometer.

4. In a speedometer, a speed wheel provided with an opening in its rim, a transparent scale member extending across said opening and having inscribed thereon over said opening a speed indicating number, there being another opening insaid speed wheel to admit light thereinto, and a lamp to supply ii ht through the lastrecited opening to illumlnate said speed indicating number when said opening in the rim of said speed wheel registers with the speed opening in the face of the speedometer. I so- In testimony whereof I hereunto afiix my signature. f

FREDERICK W. ELWORTHY. 

